We didn't collect the logs in the field, but in /var/log/messages we
found an assertion failure from NM which was more or less like "driver !
= NULL", just after logging something about the OLPC mesh device.
Wireless wasn't working at all afterwards.
The broken package is NetworkManager-0.7.2.995-1.git20100202.fc11 .
Reverting to a previous version cured the issue for us.
Let me know if this is a known problem or if you need more help tracking
it down. It can be reproduced systematically on F11-XO1.
--
// Bernie Innocenti - http://codewiz.org/
\X/ Sugar Labs - http://sugarlabs.org/